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Instruction Manual MA887 Refractometer for Seawater Measurements
CALIBRATION PROCEDURE
MEASUREMENT GUIDELINES
•
Handle instrument carefully. Do not drop.
•
Do not immerse instrument under water.
•
Do not spray water to any part of instrument except the “sample well” located over the
prism.
•
The instrument is intended to measure seawater solutions. Do not expose instrument
or prism to solvents that will damage it. This includes most organic solvents and
extremely hot or cold solutions.
•
Particulate matter in a sample may scratch the prism. Absorb sample with a soft tissue
and rinse sample well with deionized or distilled water between samples.
•
Use plastic pipettes to transfer all solutions. Do not use metallic tools such as needles,
spoons or tweezers as these will scratch the prism.
•
Cover sample well with hand if measuring in direct sun.
Calibration should be performed daily, before measurements are made, when the
battery has been replaced, between a long series of measurements, or if environmental
changes have occurred since the last calibration.
1. Press the
ON/OFF
key, then release. Two instrument test screens will be displayed
briefly; all LCD segments followed by the percentage of remaining battery life. The
meter will then briefly display an indication of the measurement unit set. When the
LCD displays dashes, the instrument is ready.
Specific Gravity (20/20) ia based upon the published relationship between density at
20 °C and the mass of dissolved salts in the seawater sample (CRC Handbook of
Chemistry and Physics, 87
th
)Edition).